Read the following passage, then choose the correct answer to questions.        

Many health experts believe that children and young people today are more unhealthy than they used to be. So why has this happened?        One reason is bad eating habits. __( 21 )__ of young people don’t have a healthy diet. They eat too much fast food like hamburgers and pizza and not enough fruit and vegetables. In the US, many children __( 22 )__ fast food regularly since they were very young. In fact, almost one-third of American children aged four to nineteen have been eating fast food __(23)__ all the time. ___(24) ___, they don’t do exercise and spend too much of their time watching TV, surfing the Internet or playing computer games.       So how can you change your habits if you have been following an unhealthy lifestyle for a long time? First, change your __(25)__ and eat more fruit and vegetables. Next, find an activity you enjoy. Why not try something different like rock climbing, surfing or hiking? Many young people have found that __(26)__ fit and healthy can be a lot of fun.     One reason is bad eating habits. __( 21 )__ of young people don’t have a healthy diet.

       One reason is bad eating habits. __( 21 )__ of young people don’t have a healthy diet.